Organic CHEM
I read on the textbook a sentence like this: "The melting and boiling points of alkanes increase as their molecular sizes increase. This is because as alkane molecules become bigger, the attractive forces between the alkane molecules become stronger." Please tell me ...
CHEM
I posted a question earlier, and i'm still abit confused. What is the reaction between potassium and aqueous sodium chloride? I was told that the products are KOH, H2, and KCl. But shouldn't the reaction be a displacement reaction? Since Potassium is more reactive than...
CHEM
Please help me, i don't know how to approach this question! All ammonium salts on heating with sodium hydroxide produce ammonia gas. From which ammonium salt can the greatest mass of ammonia be obtained? a)0.5 mol of (NH4)3PO4 b)0.5 mol of (NH4)2SO4 c)1 mol of NH4Cl d)1 mo...
CHEM
Which reactants could be used safely to prepare potassium chloride? 1. aqueous potassium hydroxide and dilute hydrochloric acid 2. aqueous potassium sulphate and aqueous sodium chloride 3. potassium and aqueous sodium chloride The answer is 1, but i don't really know how t...
Biology
Which trophic level gets the least amount of energy? a) producers b) herbivores c) carnivores d) decomposers I think the answer is c, but i'm not sure if it's right. I posted this question earlier, but google didn't provide with an answer. I still think the answer ...
Chemistry
Please check my workings to see if i'm correct, thanks! Find the percentage of nitrogen by mass in Ammonium nitrate, NH4NO3. (28/80)x 100% = 35% Is my answer correct?
Biology!
1. Urea is made where? Is it in the kidneys or the liver? 2. Which trophic level gets the least amount of energy? a) producers b) herbivores c) carnivores d) decomposers I think the answer is c, but i'm not sure if it's right.
Urgent Chemistry question!
How do i combine 2 half ionic equations into an overall equation?? 4OHˉ → 2H2O + O2 + 4e 2H+ + 2e → H2 *The "H+" is the hydrogen ion The correct overall equation is 2H2O → 2H2 + O2 How do i get that???
Chemistry
Does Sodium and potassium react with steam? Or is the reaction too violent to speak of?
Math
You mean "v" is an unknown? You cant solve an unknown without an equation.
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